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Calcium-removing method and calcium-removing device for softening desulfurization wastewater

A technology for desulfurization wastewater and feeding devices, which is applied in water softening, chemical instruments and methods, and gaseous effluent wastewater treatment, etc. It can solve the problems of increased acid addition, large sodium carbonate dosage, and high dosage costs, etc. problem, to achieve the effect of improving removal efficiency and reducing dosing cost

Inactive Publication Date: 2019-12-13
XIAMEN JIARONG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in actual engineering, there is often the problem of excessive dosage of sodium carbonate. Since the cost of sodium carbonate is relatively expensive, and the subsequent advanced treatment needs to adjust the pH, it often leads to an increase in the amount of acid added, which makes the desulfurization wastewater softening pretreatment The cost of dosing in the process remains high

Method used

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  • Calcium-removing method and calcium-removing device for softening desulfurization wastewater
  • Calcium-removing method and calcium-removing device for softening desulfurization wastewater
  • Calcium-removing method and calcium-removing device for softening desulfurization wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The inventor of the present application found in experiments: under the condition of adding the same sodium carbonate dosing ratio, compared with not adding a decalcification accelerator before adding sodium carbonate, adding decalcification before adding sodium carbonate The calcium ion concentration in the desulfurization wastewater decreased significantly after the accelerator was added with the same amount of sodium carbonate, as shown in Table 2.

[0036] Table 2 Adding Calcium Removal Hard Accelerator to the Effect of Calcium Removal

[0037]

Embodiment 2

[0039] On the basis of the above steps S1 and S2, the following test S1 was implemented: adding a decalcification accelerator to the desulfurization wastewater treated by the triple box to obtain the first produced water, wherein the volume ratio of the desulfurization wastewater and the decalcification accelerator was controlled to be 3 to 15. S2: Add sodium carbonate to the first product water obtained in step S1 for softening treatment to generate sediment and second product water, wherein the molar ratio of sodium carbonate to calcium ions in the desulfurization wastewater treated by the triple box is 1.1, and The results shown in Table 3 are obtained:

[0040] Table 3 Effect of adding calcium removal accelerator ratio on wastewater calcium removal

[0041]

[0042] It can be seen from Table 3 that adding an appropriate amount of calcium removal accelerator can significantly reduce the calcium ion in the desulfurization wastewater after the reaction in step S2, and the...

Embodiment 3

[0044] On the basis of the above steps S1 and S2, the following test S1 was implemented: adding a decalcification accelerator to the desulfurization wastewater treated by the triple box to obtain the first produced water, wherein the volume ratio of the desulfurization wastewater and the decalcification accelerator was controlled to be 3. S2: Sodium carbonate is added to the first product water obtained in step S1 for softening treatment to generate sediment and second product water, wherein the molar ratio of sodium carbonate to calcium ions in the desulfurization wastewater treated by the triple box is controlled to be 0.8 to 1.2 , and get the results shown in Table 4:

[0045] Table 4 Effects of different dosages of sodium carbonate on decalcification of wastewater

[0046]

[0047]

[0048] It can be seen from Table 4 that after adding the calcium removal accelerator in step S1, sodium carbonate with a different ratio of calcium ions in the desulfurization wastewate...

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Abstract

The invention provides a calcium-removing method and a calcium-removing device for softening desulfurization wastewater. The method comprises the following steps: a calcium removing accelerant is added into desulfurization wastewater treated by a triple box in order to obtain first produced water, wherein a volume ratio of the desulfurization wastewater to the calcium removing accelerant is controlled to be 3-15; and adding sodium carbonate into the first produced water to perform softening treatment in order to generate a precipitate and second produced water, wherein a molar ratio of the sodium carbonate to calcium ions in the desulfurization wastewater treated by the triple box is controlled to be 0.8-1.2. The method and the device can only remove calcium hardness in the softening and hardness-removing process of the desulfurization wastewater without reducing magnesium hardness, reduce the addition amount and the addition cost of chemical agents, and also improve the removal efficiency of the calcium hardness in the desulfurization wastewater under the interference condition of various ions.

Description

technical field [0001] The invention belongs to the field of desulfurization wastewater treatment, in particular to a method and device for softening and decalcifying desulfurization wastewater. Background technique [0002] At present, the limestone-gypsum wet desulfurization process is adopted in the desulfurization system of most thermal power plants in China, but when desulfurization is carried out by this method, a part of the absorbing tower slurry will be discharged as desulfurization wastewater. Desulfurization wastewater contains a large amount of suspended solids, Cl - , F - , SO 4 2- , Ca 2+ , Mg 2+ and other substances, which also contain trace amounts of heavy metal ions, are highly polluting and cannot be reused directly. In response to the call of the national environmental protection policy and to adapt to the new situation of increasingly stringent environmental protection standards, more and more power plants have put the comprehensive treatment and z...

Claims

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Application Information

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IPC IPC(8): C02F5/06C02F103/18
CPCC02F5/06C02F2103/18C02F2209/055C02F2303/22
Inventor 蒋林煜方艺民宋燕清刘德灿蒋乾虹王舒东关俊杰王少东许淑怡陈宏静黎文静
Owner XIAMEN JIARONG TECH CO LTD
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